reporter: the doping allegations arose in a case brought by lance armstrong against an insurer based in dallas, texas, who provided huge bonuses paid to armstrong for winning the tour de france in successive years. >> these are the checks making the first two payments under the contract. these checks represent when he won on the 4th and the 5th, making those payments for $1.5 million, and then $3 million. obviously -- >> attorney jeff tillisen represents the insurer who'll refused to pay more when armstrong won his sixth in 2004. >> obviously, no one would want to guarantee a payment to an event that was fixed or to which someone was cheating because that's a risk no one would take. >> well, was it fixed? >> well, my client, and we think now the evidence, clearly shows that lance armstrong was, in fact, using performance-enhancing drugs for both the fouth, fifth and sixth tour de france races, which are the ones my clients had risk on. we also think the evidence we developed showed that he had been using performance-enhancing drugs long before we ever got involved and even dating back to the b